title: Mineralization-driven bone tissue evolution follows from fluid-to-solid phase transformations in closed thermodynamic systems.
abstract: The fundamental mechanisms that govern bone mineralization have been fairly well evidenced by means of experimental research. However, rules for the evolution of the volume and composition of the bone tissue compartments (such as the mineralized collagen fibrils and the extrafibrillar space in between) have not been provided yet. As an original contribution to this open question, we here test whether mineralizing bone tissue can be represented as a thermodynamically closed system, where crystals precipitate from an ionic solution, while the masses of the fibrillar and extrafibrillar bone tissue compartments are preserved. When translating, based on various experimental and theoretical findings, this mass conservation proposition into diffraction-mass density relations, the latter are remarkably well confirmed by independent experimental data from various sources. Resulting shrinkage and composition rules are deemed beneficial for further progress in bone materials science and biomedical engineering.
authors.affiliation: Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13, 1040 Vienna, Austria. Claire.morin@tuwien.ac.at
authors.forename: Claire
authors.initials: C
authors.lastname: Morin
authors.forename: Christian
authors.initials: C
authors.lastname: Hellmich
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000502:physiology*; D002113:Calcification, Physiologic / Q000502:physiology*; D003094:Collagen / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D013816:Thermodynamics
chemical_list: D003094:Collagen
keywords: Fibrils; Hydroxyapatite precipitation; Mass conservation; Neutron diffraction; Shrinkage